2010 Liberty P0300, P0152, exhaust leak **HELP**

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Gunner0306

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So I recently picked up this 2010 Liberty, I new it had a few issues but not this serious. Currently I have codes P0300 and P0152, also I know the vehicle has exhaust leaks at both CAT's (appears new ones were welded in very poorly). I have replaced plugs and ignition coils, no doubt I have a misfire on cylinder 3 but I'm unsure of how to trouble shot and solve the problem.
Vehicle will start but it's rough, it wont idle on its own, but can be kept running by feathering the throttle. I have a scan tool from amazon and have pulled/cleared the codes mutiple times, the OBD scanner has a live data feature but I honestly dont really know how to use the information. I'm going to attemp to attach pictures.

Forgot to add I have removed the vaccuum hose from the brake booster and could not identify and leaks

ANY HELP IS GREATLY APPRECIATED!!!!!!
 

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